refactor conversation handling to remove user_id dependency and update schemas for name and email

refactor user model and schemas to consolidate name fields and remove signup schema

Refactor Dockerfile and clean up unused schemas; update Redis client initialization and environment configuration

Add MeetingController and MeetingService for scheduling and managing meetings; implement availability checks and booking functionality

Refactor conversation handling to remove request dependency and update user retrieval method; adjust schemas to remove ephemeral_key from CreateWebrtcConnectionSchema while retaining it in response.

Improve conversation handling to remove ephemeral_key from frontend and enforce modality validation

Add MeetingController and related schemas and services for meeting management

Improve conversation and file controllers to use schema validation and improve WebSocket handling

Refactor session and user models to use Link for user_id and clean up field definitions; update base repository methods to handle link rules and fetching links.

Refactor email validation and add password validation in user schemas

Add user and session schemas